Nautel NX50, Руководство по устранению неисправностей

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NX50 Troubleshooting Manual Responding to alarms
Page 1-34 Issue 6.0 2019-04-01
Rack #: Power Module #
Not Responding This alarm indicates that the rack interface PWB is not receiving a
response from the associated RF power module. Try swapping
the affected RF power module with an RF power module in
another location. If the alarm follows the RF power module,
replace the RF power module
(see “Removing and reinstalling RF
power modules” on page 1-51 ).
Rack #: Rectifier Fan 1
(or 2) Fail This alarm occurs if the speed of one of the SCR rectifier’s cooling
fans is below 3000 RPM for longer than 15 seconds. Inspect the
affected fan and, if necessary, replace it (see
“Rectifier Fan
Inspection/Replacement” on page 1-80 ).
Rack #: +15 V Fail This alarm occurs if the +15 V rail is outside the acceptable range
(12 V to 18 V). Disconnect the DC output of both +15 V power
supplies, and measure the voltage of each. If the output voltage of
either power supply measures outside of the acceptable range,
replace the affected power supply. If both power supplies measure
within the acceptable range, replace the rack interface PWB (see
“Rack Interface PWB replacement” on page 1-76 ).
Rack #: +15 V A (or B)
Fail The digital fault reporting output of 15 V power supply (U3
or U4) is active. If the o15 V Fail alarm is active, follow the
troubleshooting steps for that alarm. Otherwise, check continuity
of the cabling between the asso15 V power supply and
the rack interface PWB. If the cabling looks OK, and all
connections are tight, replace the asso15 V power supply
(see
“Low Voltage Power Supply Replacement” on page 1-81 ).
Rack #: -15 V Fail This alarm occurs if the -15 V rail is outside its acceptable range of
-12 to -18 V. Suspect a faulty dc-dc converter on the rack interface
PWB. Replace the rack interface PWB (see
“Rack Interface PWB
replacement” on page 1-76 ).
Rack #: -15 V A (or B)
Fail This alarm occurs if the associated -15 V power supply’s output
voltage is outside its acceptable range of -12 to -18 V. Suspect a
faulty dc-dc converter on the rack interface PWB. Replace the
rack interface PWB (see
“Rack Interface PWB replacement” on
page 1-76 ).
Rack #: +30 V Fail This alarm occurs if the +30 V rail has varied outside its
acceptable range of 25 to 35 V. Suspect a faulty dc-dc converter
on the rack interface PWB. Replace the rack interface PWB (see
“Rack Interface PWB replacement” on page 1-76 ).
Alarm (with Prefix) Description and Troubleshooting Action